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Wind-related processes detected by the Spirit Rover at Gusev Crater, Mars
R Greeley1, S W Squyres, R E Arvidson
1Department of Geological Sciences, Arizona State University, Box 871404, Tempe, AZ 85287-1404, USA. Greeley@asu.edu
Science (New York, N.Y.)
|August 7, 2004
Summary
Spirit rover data reveals wind-abraded rocks and sediment deposits at Columbia Memorial Station. These geological features indicate consistent north-northwest winds, shaping the Martian landscape in Gusev Crater.
Area of Science:
- Planetary Science
- Geology
- Atmospheric Science
Background:
- The Columbia Memorial Station, landing site of the Spirit rover, exhibits geological features indicative of aeolian processes.
- Understanding wind patterns on Mars is crucial for interpreting surface geology and potential habitability.
Purpose of the Study:
- To analyze wind-abraded rocks and sediment deposits at the Spirit rover's landing site.
- To determine the direction and activity of winds in Gusev Crater during the rover's mission.
Main Methods:
- Observation and analysis of wind-abraded rocks, ripples, and sediment drifts.
- Analysis of the asymmetric distribution of rock cuttings from the Rock Abrasion Tool.
- Comparison of observed geological features with atmospheric model predictions.
Main Results:
- Geomorphological evidence, including rocks and sediment deposits, suggests formative winds from the north-northwest.
- Asymmetrical distribution of rover drill cuttings indicates active midday winds from the north-northwest.
- Some rocks display characteristics, such as a two-toned appearance, suggesting burial and exhumation by wind deflation (5-60 cm).
Conclusions:
- The Spirit rover's observations are consistent with atmospheric models predicting afternoon winds in Gusev Crater.
- Active wind erosion and deposition are confirmed processes shaping the Martian surface at the landing site.
- Evidence suggests significant vertical displacement of surface materials due to wind deflation over time.
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